Patent GB-1202293-A (GB)
Title: Latch
Inventor: MENZIMER LISLE WILLIAM
IPC: E05B65/20
Filed: 1968-04-23
Abstract: 1,202,293. Latches. L. W. MENZIMER. 23 April, 1968 [29 June, 1967], No. 19065/68. Heading E2A. A latch comprising a base; a latching element 21 mounted on the base and movable between latching and unlatching positions; a detent 40 to hold the latching element in the latching position and operable to release the latching element so as to allow it to move to the unlatching position; an actuator 54 movable to and from an operated position; a transmitter 65 movable between coupling and uncoupling positions, and which when in the coupling position serves to transfer motion of the actuator to the detent so that the detent is operated to release the latching element as the actuator is moved to its operated position, and which when in the uncoupling position is moved by the actuator but does not engage the detent, so that the actuator makes only an idle movement with respect to the detent and does not operate the detent to release the latching element; locking means 67 movable between a locking position and an unlocking position respectively to move the transmitter between the uncoupling position and the coupling position; and a cancellation mechanism comprising cancellation members 45, 66, carried on the transmitter and on the latching element, so that when the transmitter is in its uncoupling position and the latching element is moved from the unlatching position to the latching position, these cancellation members come into engagement with one another and act together to move the transmitter to the coupling position, and when the transmitter is in its uncoupling position, and the actuator is moved to its operated position, the cancellation members do not engage one another as the latching element moves from the unlatching to the latching position and thus the transmitter remains in its uncoupling position. In the construction shown the transmitter 65 is pivoted to the locking means which is a lever and the cancellation member 66 is pivoted to the transmitter by means of a pin 73 which engages a slot 74 in the actuator 54; when the transmitter is disposed in the uncoupling position the pin 73 is at one end of the slot and an ear 75 of the transmitter lies alongside a flange 43 of the detent 40 so that when the actuator, which is pivoted to the base, is moved to the operated position the ear engages the flange 43 of the detent and moves it to the releasing position so that the latching element, which as shown is a bifurcated bolt, can move to the releasing position under the urge of a spring (not shown). In the active position the cancellation member 66 is disposed in the path of the other cancellation member which is a finger 45 formed on the latching element and to which the latching element biassing spring is connected and thus if the locking lever is disposed in the locking position when the door is open, movement of the latching element by its engagement with a keeper pin 23 as the door is closed causes the finger 45 to engage the cancellation member 66 and this moves the transmitter which in turn moves the locking lever to the unlocking position. If however the actuator 54 is held in the operated position and the locking lever is in its locking position during closing of the door the cancellation member 66 is moved out of the active position so that the finger 45 on the latching element 21 can no longer engage it so that when the door is closed it becomes locked. The actuator is movable from the outside of the door by a push button which is connected to a rod 50 which engages a offset flange 51 of the actuator. To release the latching element from inside of the vehicle a remote handle (not shown) is connected by a rod (not shown) to a bell crank (not shown) pivoted to the base; when the inside handle is actuated the bell crank is pivoted clockwise to cause one of its arms to move under and lift a cross arm 55 of the actuator which in turn moves the transmitter to cause the detent to release the latching element as previously described. The locking lever 67 can be moved between locking and unlocking positions by a garnish button not shown connected to the lever by a rod 76.